[swift-evolution] [Pitch] Introducing #fileName debug identifier

[Pyry Jahkola]

> On 14 Mar 2016, at 12:40, Radosław Pietruszewski via swift-evolution <swift-evolution at swift.org> wrote:
> 
> Agreed. It’s really not useful for anyone to see `/Users/radex/Documents/Projects/MillionDollarAppIdea/` when logging errors or… anything really.
> 
> I think a project-relative path should just be the new #file. I’m not even sure the full absolute path is necessary — but if it is, I’d rename it.

I think the biggest part of the problem is that Xcode has no option for building the project with relative file paths.

If file paths were relative (and `$PWD` were set to the project root—like it indeed is!) then `#file` would be the relative name. Actually, you can try it out, just give `swiftc` a roll yourself!

$ echo 'print(#file)' > foobar.swift

$ swiftc foobar.swift -o foobar && ./foobar
foobar.swift

$ swiftc "$PWD"/foobar.swift -o foobar && ./foobar
/Users/pyrtsa/foobar.swift

— Pyry
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